Datasheet

SCL
SDA
START
1 2 6 7
8
9
8-ELW0DVWHUFRGH³00001[[[´
Not-Acknowledge
from the Device
NACK
5
Standard-Fast Mode Hs-Mode
Repeated
START
1 2
MSB
7-bit Slave
Address
DAC101C081, DAC101C081Q, DAC101C085
SNVS801A –APRIL 2012–REVISED MARCH 2013 www.ti.com
Figure 25. Beginning Hs-Mode Communication
I
2
C™ Slave (Hardware) Address
The DAC has a seven-bit I
2
C™ slave address. For the VSSOP-8 version of the DAC, this address is configured
by the ADR0 and ADR1 address selection inputs. For the DAC101C081, the address is configured by the ADR0
address selection input. ADR0 and ADR1 can be grounded, left floating, or tied to V
A
. If desired, the address
selection inputs can be set to V
A
/2 rather than left floating. The state of these inputs sets the address the DAC
responds to on the I
2
C™ bus (see Table 2). In addition to the selectable slave address, there is also a broadcast
address (1001000) for all DAC101C081's and DAC101C085's on the 2-wire bus. When the bus is addressed by
the broadcast address, all the DAC101C081's and DAC101C085's will respond and update synchronously.
Figure 26 and Figure 27 describe how the master device should address the DAC via the I
2
C™-Compatible
interface.
Keep in mind that the address selection inputs (ADR0 and ADR1) are only sampled until the DAC is correctly
addressed with a non-broadcast address. At this point, the ADR0 and ADR1 inputs Tri-State and the slave
address is "locked". Changes to ADR0 and ADR1 will not update the selected slave address until the device is
power-cycled.
Table 2. Slave Addresses
DAC101C081 (SOT &
DAC101C085 (VSSOP-8)
Slave Address
WSON)
(1)
[A6 - A0]
ADR1 ADR0 ADR0
0001100 Floating Floating Floating
0001101 Floating GND GND
0001110 Floating V
A
V
A
0001000 GND Floating ---------------
0001001 GND GND ---------------
0001010 GND V
A
---------------
1001100 V
A
Floating ---------------
1001101 V
A
GND ---------------
1001110 V
A
V
A
---------------
1001000 --------------- Broadcast Address ---------------
(1) Pin-compatible alternatives to the DAC101C081 options are available with additional address options.
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